It is customary to find young men and women in sports.

Analyze the question: The word in italics is "customary." You need the option that means the opposite.

Explain the concept: "Customary" means usual, habitual, or according to custom. This is an antonym question, so look for a word meaning unusual or uncommon.

Solution:

• A. Common means usual or widespread. This is a synonym of "customary," not an opposite.
• B. Unusual means not habitual or out of the ordinary. This is the direct opposite.
• C. Unideal means not perfect. It has no link to how often something happens.
• D. Unnecessary means not needed. This is about need, not frequency or custom.

Check it in the sentence: "It is unusual to find young men and women in sports" is the opposite of "It is customary to find young men and women in sports." The meaning flips cleanly.

Answer: B. Unusual

Tip: For antonym questions, first find a synonym of the given word (customary = usual, normal). Then eliminate any option that matches it (here, "common") and pick the option that reverses it. Examiners often put a synonym among the options to trap you, so read the question carefully for the word "opposite."